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#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include "obj.h"
ObjModel* ObjLoadModel(char *memory, size_t size)
{
char *p = NULL, *e = NULL;
ObjModel *ret = (ObjModel *) calloc(1, sizeof(ObjModel));
memset(ret, 0, sizeof(ObjModel));
p = memory;
e = memory + size;
/* count the number of normals, texcoords, vertices, and faces, line by line */
while (p != e)
{
if (memcmp(p, "vn", 2) == 0) ret->nNormal++;
else if (memcmp(p, "vt", 2) == 0) ret->nTexCoord++;
else if (memcmp(p, "v", 1) == 0) ret->nVertex++;
else if (memcmp(p, "f", 1) == 0) ret->nFace++;
while (*p++ != (char) 0x0A);
}
/* allocate memory for arrays */
ret->VertexArray = (ObjVertex *) malloc(sizeof(ObjVertex) * ret->nVertex);
ret->NormalArray = (ObjNormal *) malloc(sizeof(ObjNormal) * ret->nNormal);
ret->TexCoordArray = (ObjTexCoord *) malloc(sizeof(ObjTexCoord) * ret->nTexCoord);
ret->FaceArray = (ObjFace *) malloc(sizeof(ObjFace) * ret->nFace);
p = memory;
int nV = 0, nN = 0, nT = 0, nF = 0;
while (p != e)
{
if (memcmp(p, "vn", 2) == 0)
{
sscanf(p, "vn %f %f %f", &ret->NormalArray[nN].x,
&ret->NormalArray[nN].y,
&ret->NormalArray[nN].z);
nN++;
}
else if (memcmp(p, "vt", 2) == 0)
{
sscanf(p, "vt %f %f", &ret->TexCoordArray[nT].u,
&ret->TexCoordArray[nT].v);
nT++;
}
else if (memcmp(p, "v", 1) == 0) /* or *p == 'v' */
{
sscanf(p, "v %f %f %f", &ret->VertexArray[nV].x,
&ret->VertexArray[nV].y,
&ret->VertexArray[nV].z);
nV++;
}
/* quad */
else if (memcmp(p, "f", 1) == 0) /* or *p == 'f' */
{
sscanf(p, "f %d/%d/%d %d/%d/%d %d/%d/%d %d/%d/%d",
&ret->FaceArray[nF].Vertex[0],
&ret->FaceArray[nF].TexCoord[0],
&ret->FaceArray[nF].Normal[0],
&ret->FaceArray[nF].Vertex[1],
&ret->FaceArray[nF].TexCoord[1],
&ret->FaceArray[nF].Normal[1],
&ret->FaceArray[nF].Vertex[2],
&ret->FaceArray[nF].TexCoord[2],
&ret->FaceArray[nF].Normal[2],
&ret->FaceArray[nF].Vertex[3],
&ret->FaceArray[nF].TexCoord[3],
&ret->FaceArray[nF].Normal[3]);
nF++;
}
/* seek to a newline */
while (*p++ != (char) 0x0A);
}
/* sanity check */
if ((ret->nVertex != nV) || (ret->nNormal != nN) || (ret->nTexCoord != nT)
|| (ret->nFace != nF))
{
fprintf(stdout, "obj loader: warning, the number of scanned items does not equal to number of read\n");
if (ret->nVertex != nV)
fprintf(stdout, "vertices: scanned %d, read %d\n", ret->nVertex, nV);
if (ret->nNormal != nN)
fprintf(stdout, "normals: scanned %d, read %d\n", ret->nNormal, nN);
if (ret->nTexCoord != nT)
fprintf(stdout, "texcoords: scanned %d, read %d\n", ret->nTexCoord, nT);
if (ret->nFace != nF)
fprintf(stdout, "faces: scanned %d, read %d\n", ret->nFace, nF);
}
return ret;
}
size_t ObjLoadFile(char *szFileName, char **memory)
{
size_t bytes = 0;
FILE *file = fopen(szFileName, "rt");
if (file != NULL)
{
fseek(file, 0, SEEK_END);
size_t end = ftell(file);
fseek(file, 0, SEEK_SET);
*memory = (char *) malloc(end);
bytes = fread(*memory, sizeof(char), end, file);
fclose(file);
}
return bytes;
}
void ObjFree(ObjModel *model)
{
free(model->NormalArray);
free(model->TexCoordArray);
free(model->FaceArray);
free(model->VertexArray);
free(model);
}
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